Which of the following is most soluble on water?
Correct answer: D. MgSO4
- A. BaSO4
- B. SrSO4
- C. CaSO4
- D. MgSO4
Explanation
The solubility of alkaline-earth sulfates generally increases up the group, so MgSO4 is much more soluble in water than CaSO4, SrSO4 and BaSO4. Thus option d is correct. Students may choose BaSO4 because barium compounds are often thought to be soluble, but BaSO4 is notably insoluble and is used in barium meals.
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About Solubility Product
The solubility product constant, Ksp, represents the equilibrium concentrations of ions from a sparingly soluble salt, each raised to its stoichiometric power. Problems involve writing Ksp expressions, calculating molar solubility, applying the common-ion effect and predicting precipitation from the ionic product.
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